Lexus IS300H 2017 Manual page 483

The interior lights and personal lights can be operated when
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The interior lights and personal lights can be used regardless of the power switch mode.
However, when the power switch is turned off, they can be used only when the 12-volt
battery protection function is not operating.
12-volt battery protection function
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To prevent the 12-volt battery from being discharged, approximately 20 minutes after
the power switch is turned off, the power supplied to the interior lights, personal lights,
and other lights will be cut off automatically. (If the interior lights, etc. are left on when the
power switch is turned off, they will be turned off automatically.)
To turn the interior lights, etc. back on, turn the power switch to ACCESSORY or ON
mode or operate the interior light switch until the interior lights turn on.
If any of the lights are illuminated automatically due to the illuminated entry system, the
12-volt battery protection function will be canceled.
Illuminated entry system
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The lights automatically turn on/off according to power switch mode, the presence of the
electronic key, whether the doors are locked/unlocked, and whether the doors are
opened/closed.
Customization
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Setting (e.g. the time elapsed before lights turn off) can be changed.
(Customizable features: P. 657)
NOTICE
To prevent 12-volt battery discharge, do not leave the lights on longer than necessary
when the hybrid system is off.
6-3. Using the interior lights
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